EP1638848A1 - Container exhibiting improved top load performance - Google Patents

Container exhibiting improved top load performance

Info

Publication number
EP1638848A1
EP1638848A1 EP03786591A EP03786591A EP1638848A1 EP 1638848 A1 EP1638848 A1 EP 1638848A1 EP 03786591 A EP03786591 A EP 03786591A EP 03786591 A EP03786591 A EP 03786591A EP 1638848 A1 EP1638848 A1 EP 1638848A1
Authority
EP
European Patent Office
Prior art keywords
ribs
plastic container
wave shaped
container according
generally
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03786591A
Other languages
German (de)
French (fr)
Other versions
EP1638848B1 (en
Inventor
Satya Kamineni
Michael Mooney
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Constar International LLC
Original Assignee
Constar International LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Constar International LLC filed Critical Constar International LLC
Publication of EP1638848A1 publication Critical patent/EP1638848A1/en
Application granted granted Critical
Publication of EP1638848B1 publication Critical patent/EP1638848B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0018—Ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0018—Ribs
    • B65D2501/0027—Hollow longitudinal ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0018—Ribs
    • B65D2501/0036—Hollow circonferential ribs

Definitions

  • This invention relates generally to the field of consumer packaging. More specifically, this invention relates to plastic containers of the type that are used to package consumer beverages, and the strength characteristics of such plastic containers.
  • Plastic containers are in wide use commercially throughout the world for packaging liquids of all types, including consumer beverages.
  • the most common type of plastic container that is used for packaging, for example, soft drinks, is fabricated from polyethylene terephthalate (PET) and is molded into a desired shape using a blowmolding process that is well known in the industry.
  • PET polyethylene terephthalate
  • the container must be chemically resistant and should be shaped to avoid concentration of stress that result in unwanted failure. In addition, the container must be strong enough to endure the packaging process and subsequent handling during the gross packaging, shipping and retail display stages.
  • top load strength involves resistance to failure, typically sidewall buckling, when a vertical force is exerted onto the top of the container. Such vertical force is exerted onto the container during the filling process and when the closure is installed onto the container. In addition, a great deal of vertical force may be exerted onto filled containers when cases of the containers are stacked during shipping.
  • Another type of strength that is regularly evaluated in the design of plastic containers is hoop strength.
  • Hoop strength is the resistance provided by the container against the tendency of the container sidewall to bow outwardly or deflect inwardly when the contents of the container are under pressurization or when external forces are applied to the outside of the container, which of course is a common scenario in the packaging and transportation of carbonated soft drinks.
  • a plastic container that is constructed according to a first aspect of the invention includes a finish portion; and a generally cylindrical main body portion, said main body portion comprising a sidewall having a first plurality of generally vertical ribs defined therein, the sidewall further having a second plurality of generally horizontal wave shaped ribs defined therein, at least one of the generally horizontal wave shaped ribs intersecting with at least one of the generally vertical ribs, whereby enhanced strength characteristics are imparted to the container.
  • FIGURE 1 is a side elevational view of a plastic container that is constructed according to a preferred embodiment of the invention
  • FIGURE 2 is a cross-sectional view taken along lines 2-2 in FIGURE 1 ;
  • FIGURE 3 is a cross-sectional view taken along blinds 3-3 in FIGURE 1; and FIGURE 4 is a diagrammatical depiction of one of the wave-shaped ribs with the circumference of the container represented along the x-axis.
  • a plastic container 10 that is constructed according to a preferred embodiment of the invention includes a finish portion 12 and a generally cylindrical main body portion 14 having an outer sidewall 16.
  • plastic container 10 is fabricated from a plastic material such as polyethylene terephthalate.
  • body portion 14 has a first plurality of generally vertical ribs 18, 20, 22, 24 defined therein.
  • Vertical ribs 18, 20, 22, 24, as shown in the cross-sectional view provided in FIGURE 3, are substantially concave, having a radius of depth R 2 , and extend generally radially inwardly toward the center axis of the container 10.
  • the vertical ribs are preferably parallel to each other and evenly spaced from each other over the outer circumference of the main body portion 14 of the container 10.
  • the sidewall 16 further has a second plurality of generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 defined therein.
  • the generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 preferably extend so as to be parallel with each other and are substantially evenly spaced from each other. It follows, then, that each of the wave shaped ribs has a common amplitude A and wavelength with each of the other wave shaped ribs, with the amplitude A being defined as the peak to peak vertical distance between the uppermost point of the wave crest to the lowermost point of the adjacent wave trough and the wavelength being defined as the circumferential peak to peak distance traveled by the rib from wave crest to wave crest.
  • Each horizontal wave shaped rib is substantially concave, having a radius of depth R l5 and extending inwardly toward the center axis of the container 10.
  • at least one of the generally horizontal wave shaped ribs intersects with at least one of said generally vertical ribs, whereby enhanced strength characteristics are imparted to the container.
  • each of the generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 intersects with each of the 16 vertical ribs.
  • a plurality, and more preferably at least three of the vertical ribs intersect each wave shaped rib within each wavelength.
  • the location or placement of the vertical ribs is harmonized with respect to the waveform of at least one of the horizontal ribs.
  • the vertical ribs 18, 20, 22, 24 will intersect each of the generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 in a repeating pattern such that each of the vertical ribs 18 intersects each wave shaped rib at the lowermost point of the wave trough, and so that each of the vertical ribs 20 intersects each wave shaped rib at a median location between the wave trough and an adjacent wave peak.
  • each vertical rib 22 will intersect each wave shaped rib at the wave peak and each vertical rib 24 will intersect each wave shaped rib at a median location between the wave peak and the next wave trough. Accordingly, at least one of the generally vertical ribs 18, 20, 22, 24 intersects at least one of the generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 at a location of maximum amplitude of the wave shaped rib, and another one of the generally vertical ribs intersects the horizontal wave shaped rib at a location of minimum amplitude. This is believed to maximize both the hoop strength and top load strength that is achievable by the structure. As may be visualized in FIGURE 1, sidewall 16 of the generally cylindrical main body portion 14 has an outer circumference.
  • each wave-shaped rib preferably has a repeating wavelength ⁇ and a common amplitude A.
  • An angle ⁇ is defined by a triangle, two legs of which are equal to the amplitude A and one-half the wavelength ⁇ .
  • the amplitude A of the wave shaped ribs is within a range of about 4.5 percent to about 30 percent of the wavelength ⁇ , which corresponds to angle ⁇ being within a range of about 5 degrees to about 30 degrees.
  • the wavelength ⁇ should preferably be about 6 percent to about 40 percent of the outer circumference of the container.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

A plastic container (10) that exhibits an optimal ratio of hoop strength to top load strength includes a finish portion (12) and generally cylindrical main body portion (14). The main body portion includes a sidewall (16) that has a first plurality of generally vertical ribs (18, 20, 21, 24) defined therein. In addition, a second plurality of generally horizontal wave (26, 28, 30, 32, 34, 36) shaped ribs is defined in the sidewall. The generally horizontal wave shaped ribs intersect with the generally vertical ribs, thereby imparting enhanced strength characteristics to the container (10).

Description

CONTAINER EXHIBITING IMPROVED TOP LOAD PERFORMANCE
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to the field of consumer packaging. More specifically, this invention relates to plastic containers of the type that are used to package consumer beverages, and the strength characteristics of such plastic containers.
2. Description of the Related Technology
Plastic containers are in wide use commercially throughout the world for packaging liquids of all types, including consumer beverages. The most common type of plastic container that is used for packaging, for example, soft drinks, is fabricated from polyethylene terephthalate (PET) and is molded into a desired shape using a blowmolding process that is well known in the industry.
In the design of such containers, a number of factors are ordinarily considered. The container must be chemically resistant and should be shaped to avoid concentration of stress that result in unwanted failure. In addition, the container must be strong enough to endure the packaging process and subsequent handling during the gross packaging, shipping and retail display stages.
One type of strength that plastic containers are regularly evaluated for it is that of top load strength. Top load strength involves resistance to failure, typically sidewall buckling, when a vertical force is exerted onto the top of the container. Such vertical force is exerted onto the container during the filling process and when the closure is installed onto the container. In addition, a great deal of vertical force may be exerted onto filled containers when cases of the containers are stacked during shipping. Another type of strength that is regularly evaluated in the design of plastic containers is hoop strength. Hoop strength is the resistance provided by the container against the tendency of the container sidewall to bow outwardly or deflect inwardly when the contents of the container are under pressurization or when external forces are applied to the outside of the container, which of course is a common scenario in the packaging and transportation of carbonated soft drinks.
It is generally known in the industry that circumferential reinforcement such as ribbing tends to increase hoop strength, and that vertical reinforcement has a favorable effect on top load strength. However, it should be understood that there is a to economic disincentive to provide any more reinforcement to a plastic container design than is absolutely necessary, because increased reinforcement tends to make the container heavier and thus more expensive to manufacture. A need exists, then, for a plastic container design that optimizes hoop strength and top load strength while minimizing the amount of plastic material that is necessary to fabricate the container.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a plastic container design that optimizes hoop strength and top load strength while minimizing the amount of plastic material that is necessary to fabricate the container. In order to achieve the above and other objects of the invention, a plastic container that is constructed according to a first aspect of the invention includes a finish portion; and a generally cylindrical main body portion, said main body portion comprising a sidewall having a first plurality of generally vertical ribs defined therein, the sidewall further having a second plurality of generally horizontal wave shaped ribs defined therein, at least one of the generally horizontal wave shaped ribs intersecting with at least one of the generally vertical ribs, whereby enhanced strength characteristics are imparted to the container.
These and various other advantages and features of novelty that characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages, and the objects obtained by its use, reference should be made to the drawings which form a further part hereof, and to the accompanying descriptive matter, in which there is illustrated and described a preferred embodiment of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGURE 1 is a side elevational view of a plastic container that is constructed according to a preferred embodiment of the invention;
FIGURE 2 is a cross-sectional view taken along lines 2-2 in FIGURE 1 ;
FIGURE 3 is a cross-sectional view taken along blinds 3-3 in FIGURE 1; and FIGURE 4 is a diagrammatical depiction of one of the wave-shaped ribs with the circumference of the container represented along the x-axis.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) Referring now to the drawings, wherein like reference numerals designate corresponding structure throughout the views, and referring in particular to FIGURE 1, a plastic container 10 that is constructed according to a preferred embodiment of the invention includes a finish portion 12 and a generally cylindrical main body portion 14 having an outer sidewall 16. Preferably, plastic container 10 is fabricated from a plastic material such as polyethylene terephthalate. As may be seen in FIGURE 1, body portion 14 has a first plurality of generally vertical ribs 18, 20, 22, 24 defined therein. Vertical ribs 18, 20, 22, 24, as shown in the cross-sectional view provided in FIGURE 3, are substantially concave, having a radius of depth R2, and extend generally radially inwardly toward the center axis of the container 10. The vertical ribs are preferably parallel to each other and evenly spaced from each other over the outer circumference of the main body portion 14 of the container 10.
As may further be seen in FIGURE 1, the sidewall 16 further has a second plurality of generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 defined therein. The generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 preferably extend so as to be parallel with each other and are substantially evenly spaced from each other. It follows, then, that each of the wave shaped ribs has a common amplitude A and wavelength with each of the other wave shaped ribs, with the amplitude A being defined as the peak to peak vertical distance between the uppermost point of the wave crest to the lowermost point of the adjacent wave trough and the wavelength being defined as the circumferential peak to peak distance traveled by the rib from wave crest to wave crest. Each horizontal wave shaped rib is substantially concave, having a radius of depth Rl5 and extending inwardly toward the center axis of the container 10. As may be seen in FIGURE 1, at least one of the generally horizontal wave shaped ribs intersects with at least one of said generally vertical ribs, whereby enhanced strength characteristics are imparted to the container. In the preferred embodiment, it will be seen that each of the generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 intersects with each of the 16 vertical ribs. Preferably, a plurality, and more preferably at least three of the vertical ribs intersect each wave shaped rib within each wavelength. According to one important aspect of the invention, the location or placement of the vertical ribs is harmonized with respect to the waveform of at least one of the horizontal ribs. In the preferred embodiment, the vertical ribs 18, 20, 22, 24 will intersect each of the generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 in a repeating pattern such that each of the vertical ribs 18 intersects each wave shaped rib at the lowermost point of the wave trough, and so that each of the vertical ribs 20 intersects each wave shaped rib at a median location between the wave trough and an adjacent wave peak. Also, each vertical rib 22 will intersect each wave shaped rib at the wave peak and each vertical rib 24 will intersect each wave shaped rib at a median location between the wave peak and the next wave trough. Accordingly, at least one of the generally vertical ribs 18, 20, 22, 24 intersects at least one of the generally horizontal wave shaped ribs 26, 28, 30, 32, 34, 36 at a location of maximum amplitude of the wave shaped rib, and another one of the generally vertical ribs intersects the horizontal wave shaped rib at a location of minimum amplitude. This is believed to maximize both the hoop strength and top load strength that is achievable by the structure. As may be visualized in FIGURE 1, sidewall 16 of the generally cylindrical main body portion 14 has an outer circumference. As is shown in FIGURE 4, which is a diagrammatical depiction of one of the wave-shaped ribs with the circumference of the container represented along the x-axis, each wave-shaped rib preferably has a repeating wavelength λ and a common amplitude A. An angle θ is defined by a triangle, two legs of which are equal to the amplitude A and one-half the wavelength λ. Preferably, the amplitude A of the wave shaped ribs is within a range of about 4.5 percent to about 30 percent of the wavelength λ, which corresponds to angle θ being within a range of about 5 degrees to about 30 degrees. The wavelength λ should preferably be about 6 percent to about 40 percent of the outer circumference of the container.
It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims

WHAT IS CLAIMED IS:
1. A plastic container, comprising: a finish portion; and a generally cylindrical main body portion, said main body portion comprising a sidewall having a first plurality of generally vertical ribs defined therein, said sidewall further having a second plurality of generally horizontal wave shaped ribs defined therein, at least one of said generally horizontal wave shaped ribs intersecting with at least one of said generally vertical ribs, whereby enhanced strength characteristics are imparted to the container.
2. A plastic container according to claim 1, wherein said container is fabricated from a plastic material comprising polyethylene terephthalate.
3. A plastic container according to claim 1, wherein said first plurality of generally vertical ribs comprise at least one rib that is inwardly oriented.
4. A plastic container according to claim 1, wherein said second plurality of generally horizontal wave shaped ribs comprise at least one rib that is inwardly oriented.
5. A plastic container according to claim 1, wherein said second plurality of generally horizontal wave shaped ribs comprise a plurality of wave shaped ribs that extend generally parallel to each other.
6. A plastic container according to claim 1, wherein said second plurality of generally horizontal wave shaped ribs are shaped so as to have a common amplitude and a common wavelength.
7. A plastic container according to claim 6, wherein said common amplitude A is within a range of about 4.5 percent to about 30 percent of the common wavelength.
8. A plastic container according to claim 6, wherein said sidewall has an outer circumference, wherein said wavelength is within a range of about 6 percent to about 40 percent of said outer circumference.
9. A plastic container according to claim 1, wherein at least one of said generally vertical ribs intersects at least one of said generally horizontal wave shaped ribs at a location of maximum amplitude of said wave shaped rib.
10. A plastic container according to claim 1, wherein at least one of said generally vertical ribs intersects at least one of said generally horizontal wave shaped ribs at a location of minimum amplitude of said wave shaped rib.
11. A plastic container according to claim 1, wherein at least one of said generally horizontal wave shaped ribs has a periodic wavelength, and wherein a plurality of said vertical ribs intersect said wave shaped rib within each wavelength.
12. A plastic container according to claim 11, wherein at least three of said vertical ribs intersect said wave shaped rib within eaeh wavelength.
13. A plastic container according to claim 11, wherein the location of said vertical ribs is harmonized with respect the waveform of at least one of said horizontal ribs.
14. A plastic container according to claim 1, wherein the location of said vertical ribs is harmonized with respect the waveform of at least one of said horizontal ribs.
EP03786591A 2003-03-12 2003-11-05 Container exhibiting improved top load performance Expired - Lifetime EP1638848B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38724203A 2003-03-12 2003-03-12
PCT/US2003/035337 WO2004080828A1 (en) 2003-03-12 2003-11-05 Container exhibiting improved top load performance

Publications (2)

Publication Number Publication Date
EP1638848A1 true EP1638848A1 (en) 2006-03-29
EP1638848B1 EP1638848B1 (en) 2010-07-28

Family

ID=32987330

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03786591A Expired - Lifetime EP1638848B1 (en) 2003-03-12 2003-11-05 Container exhibiting improved top load performance

Country Status (8)

Country Link
US (1) US7469796B2 (en)
EP (1) EP1638848B1 (en)
AT (1) ATE475597T1 (en)
AU (1) AU2003295405B2 (en)
CA (1) CA2556691C (en)
DE (1) DE60333598D1 (en)
RU (1) RU2337863C2 (en)
WO (1) WO2004080828A1 (en)

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Also Published As

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AU2003295405B2 (en) 2010-04-22
US20070012649A1 (en) 2007-01-18
RU2006110620A (en) 2006-08-27
DE60333598D1 (en) 2010-09-09
ATE475597T1 (en) 2010-08-15
CA2556691A1 (en) 2004-09-23
US7469796B2 (en) 2008-12-30
WO2004080828A1 (en) 2004-09-23
RU2337863C2 (en) 2008-11-10
AU2003295405A1 (en) 2004-09-30
EP1638848B1 (en) 2010-07-28
CA2556691C (en) 2012-08-21

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